Crossword clue: the quality of being opaque to a degree; the degree to which something reduces the passage of light
2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
the quality of being opaque to a degree; the degree to which something reduces the passage of light
the quality of being opaque to a degree; the degree to which something reduces the passage of light